LocalStack targets AWS service APIs; LocalCloud targets Google Cloud service APIs.
Comparison
LocalCloud vs LocalStack
LocalStack is a mature local cloud development platform for AWS. LocalCloud is a local Google Cloud runtime. They solve the same shape of problem for different clouds, so the choice usually follows the cloud your application already targets rather than a feature score.
LocalCloud currently lists 27 available Google Cloud service guides in one Docker image.
The two are not interchangeable: AWS SDK calls do not reach LocalCloud, and Google Cloud SDK calls do not reach LocalStack.
Use LocalStack when your application targets AWS
If the code under test calls S3, DynamoDB, Lambda, SQS, or any other AWS API, LocalStack is the correct tool and LocalCloud cannot substitute for it. LocalStack is also the more established project, with a longer public track record, a larger community, and a wider published integration surface. Teams that need a local AWS surface should choose LocalStack.
Use LocalCloud when your application targets Google Cloud
If the code under test calls BigQuery, Pub/Sub, Spanner, Bigtable, or Cloud Storage, LocalCloud gives those Google Cloud SDK calls a local endpoint. LocalStack does not emulate Google Cloud APIs, so a GCP-native team cannot use it to exercise BigQuery or Spanner behavior locally.
Running both is a normal outcome
Teams that build on both clouds commonly run LocalStack for the AWS half of a system and LocalCloud for the Google Cloud half. The two runtimes bind different local ports and set different SDK environment variables, so they can run side by side in the same development environment or automation job.
Compatibility
Local check versus release validation
| Decision point | LocalStack | LocalCloud |
|---|---|---|
| Cloud emulated | Amazon Web Services. | Google Cloud. |
| SDK routing | AWS SDK endpoint overrides. | Google Cloud SDK emulator environment variables and endpoint overrides. |
| Pick it when | Your application calls AWS APIs, or you need the most established local cloud project. | Your application calls Google Cloud APIs and needs BigQuery, Spanner, or Bigtable locally. |
| Agent sandbox use | Gives agent-written AWS code a local target. | Gives agent-written Google Cloud code a local target with no default credentials or billing project. |
| Licensing | Review the LocalStack license and plan terms directly. | Proprietary LocalCloud Public Preview License; review before use. |
Use the sandbox deliberately
- Permitted workflows use local endpoint values and should stop rather than fall back to real Google Cloud or real credentials. The Public Preview License permits individuals and organizations, including for-profit companies, to use LocalCloud for non-production internal development, testing, CI, evaluation, and pilots.
- LocalCloud emulates bounded local development workflows. Validate application behavior against real Google Cloud before production deployment.
- Before production deployment, unset LocalCloud emulator environment variables and validate behavior against real Google Cloud.
Keep the agent on the supported path
- LocalStack for Google Cloud — What a LocalStack-style workflow looks like on Google Cloud.
- Local cloud for AI agents — Why an agent needs a cloud API target, not only a code sandbox.
- Compatibility — Current LocalCloud service boundaries.
Claims are tied to current sources
- LocalStack — Vendor description of the AWS local cloud development platform.
- LocalCloud compatibility — LocalCloud operation-level status.
- LocalCloud agentic facts reviewed 2026-08-26.